Few years back I bought 3 little cuttings of hydrangea, supposedly coming from a particular deep blue bush that was pictured in the listing.  I put 2 of the cuttings in large tubs, and the leftover 3rd I just poped into the ground.  I also got the right blue hydrangea fertilizer. 

Next year when the plants flowered I was somewhat  surprised when 2 were stark white, absolutely snow white - it was one of those in tubs and the one in the ground.  The other one in the second tub got green and maroon flowers.  This year I still have one pure white and the other tub still has the green/maroon flowers, but the one in the ground turned from pure white to also green/maroon!  But today among the green/maroon on the bush in the ground there was one baby pink with maroon spots.  I always thought that in  hydrangeas white will always stay white, while the blue can turn pink (and vice versa) depending on soil acidity. So, what is going on? 

Here are the 2 blooms - the white is acually pink- from the same bush.